VIDEO: Channel 11 Talks To Man Who Witnessed Fatal Petersen Events Center Fall

The Allegheny County Medical Examiner's Office identified the victim as Joseph Kimutis, 19, of South Fayette.

Kimutis' death happened during a concert by Furthur, a band that includes two former Grateful Dead members.

Kimutis, a former Seton-La Salle High School student, was rushed to UPMC Presbyterian Hospital after smashing through the window at the arena and falling about 40 feet on Wednesday night.

Pittsburgh police are checking on a report that Kimutis ran up and down escalators that were off, drank a beer and got into a three-point football stance and yelled “hike” before charging the inch-thick, double-paned window.

"I didn't expect someone to be running full speed at a pane of glass from 10 feet away," said a witness. "I thought he was going to start dancing. But now in hindsight it appeared as if he was preparing to do a sprint race and he just bolted forward and before I knew it he had gone through the bottom pane of glass."

We talked with a worker there who maintains the windows. He told Channel 11 that something like this shouldn't have happened.

"It’s a fluke for something like that to happen. It’s sad for what happened to that kid,” glass worker said.

Seton guidance counselor Judy Caves remembers Kimutis as a smiling student who was excited about his future.

“He had a bright future ahead of him,” Caves said. “Going to a concert can be a fun thing. I wonder what went wrong. I feel for the family."

Police Lt. Daniel Herrmann said Kimutis was reportedly "a little out of it" Wednesday night.

“I don't think it's a time to place fingers or guilt,” Caves said. “It was just something that went wrong."

Kimutis was initially rushed to an area hospital with broken legs, arms and a broken pelvis, police said. He died shortly after midnight, the medical examiner said.

An autopsy reported Kimutis died of blunt force trauma to the head and neck. Homicide investigators said they continued interviewing witnesses on Friday, trying to piece together what led up to the deadly dive.

Detectives still are not sure what caused him to fall through the window.

Police are awaiting toxicology results to determine if drugs or alcohol were involved.

A Facebook page has been created in Kimutis's memory. Friends and strangers alike are posting their condolences to his family. One post read, "You were too young Joey, but we all know you're in a better place now and that you'll never be forgotten. We miss you already. R.I.P."